The effects of motor parameters on the performance of brushless DC drives

A simulation model for predicting the transient performance of brushless DC drives is described. The model does not require assumptions of phase balance of either the power electronic converter or the motor, nor are idealized waveforms for the induced voltage or phase and mutual inductance terms necessary. The model is applied to drives for which neither equivalent-circuit nor d-q axis analyses are rigorously applicable. Test results establish the degree of correlation of the predictions with a practical example. The model is then used to conduct a sensitivity study that not only explores the degrees of model complexity necessary for adequate representation but also provides guidelines to system designers on the effects of certain practical configurations. The importance of the interaction of converter details, such as the pulse-width-modulated (PWM) technique, and motor parameters, such as the induced voltage waveform, is stressed in the approach considered